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  3. A stroll to school in the morning can help kids prepare for the stresses that await them in the classroom. They’ll have less【C1】

A stroll to school in the morning can help kids prepare for the stresses that await them in the classroom. They’ll have less【C1】

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问题     A stroll to school in the morning can help kids prepare for the stresses that await them in the classroom. They’ll have less【C1】______increases in heart rate and blood pressure when they’re put on the spot. That’s the【C2】______from a new study by researchers at the University of Buffalo medical school.
    Those researchers【C3】______assigned a group of kids aged 10 to 14 either to sit in a comfortable chair while watching a slide show of a suburban neighborhood(to simulate a car ride) 【C4】______to walk a mile on a treadmill, wearing a backpack, while the same slide show【C5】______ (to simulate a walk to school).
    After that, all the kids were asked to【C6】______a quick test—the famous Stroop task,【C7】______you have to read the name of color when the word has been printed in a(n) 【C8】______color. The kids who’d walked a mile showed fewer【C9】______of physical stress in front of the testers—with statistically significantly smaller increases in heart rate and blood pressure—and gave lower ratings, too, when asked about how stressed they【C10】______felt. Exercise, it seems, "may blunt children’s cardiovascular(心脑血管的)reactivity when【C11】______with cognitive stressors during the school day," the researchers says.
    How did this happen? According to the Buffalo researchers, one way that walking exercise may【C12】______stress-induced cardiovascular reactivity is by altering an individual’s evaluation of stressful stimuli such as reducing the【C13】______threat of the event.
    Getting some exercise, in other【C14】______may help kids put minor challenges like the Stroop task in perspective, keeping their nervousness【C15】______check. So, parents, if you do live in an area where it’s【C16】______for children to walk the streets, don’t be afraid to let your kids walk to school. And don’t forget, either, that there’s plenty of evidence to【C17】______the stress-busting benefits of exercise for adults as well. You wouldn’t let a family dog stay indoors all day【C18】______getting out for a walk now and then.【C19】______yourself some time to get out of the house and the office once in a【C20】______too.
【C9】
选项 A、signals
B、signs
C、symptoms
D、symbols
答案B
解析 考查名词辨析。破折号后面的内容是实验表现出来的“迹象”，用sign符合句意。signal一般指“信号”，不妥：symptom指“症状”，这里不是医学实验；symbol“象征，符号”。
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